Dentifrice material



Patented May 5, 1925. I i UNITED STATES PATENT OFFICE. FERDITIAND W. NITABLDY, F BROOKLYN, NEW YORK, ASSIGNOR TO E. It. SQUIBB 80 I SONS, 01! NEW YORK, N. Y A CORPORATION OF NEW YORK.

V DENTIFRICE MATERIAL. No Drawing. Application filed November 13, 1923. Serial No. 674,484.

Torill whom it may concern: ther .advantage magnesium hydroxide is soft ,Be it known that I, FERDINAND W. and non-injurious and is, therefore, a suit- Nrranny, a citizen of the United States, reablematenal for use as an ingredient of siding at Brooklyn, in the countyof Kings,\ dent1fr1ces.

5 State of New York, have invented certain In preparing the material milk of mag- 60 new and useful Improvements in Dentifrice nesi-a, i. e., a suspension of magnesium hy- Material, and I do hereby declare the foldroxide in water, is first produced in any lowing to be a' full, clear, and exact descripsuitable manner, various methods being tion of the invention, such as will enable known in the art. The water is then others skilled in the art to which it apperdrainedfrom the suspension so far as this is 65 tains to make and use the same. possible, leaving a mass of magnesium hy- This invention relates to a dentifrice madroxide suspended in approximately 8670 terial, and particularly to a product which of water by weight based upon the total is adapted to be incorporated in pastes and weight of the mass. The proportions of to impart thereto certain desired properties. magnesium hydroxide and water will, of 70 Pastes are commonly employed as denticourse, vary depending upon the time durfrices andhave been manufactured in the ing which the mass is permitted to drain past from various materials, particularly and these proportions are not essential to the precipitated chalk. This material alone is invention.

not adaptedto neutralize the acids, which After draining the mass is placed in a 75 r in the m h a therefore, a suitable evaporating pan which may be opsatlsfactory lfl Magneslum yerated under vacuum or otherwise, depend- (lI'OXidB iS a mild alkali and 3. suitable dening upon the available equip nent, The pan tifrice material but it is chemically reactive h uld be of glass, Monel metal or other to a consider le gr n in th 113581108 suitable material which is not susceptible to of water chemical reactions occur etween orrosion in the presence of weak alkalies.

. the ingredients Of the PitSt which cause it to Glyeerine of the usual commercial purity is harden and th s c m 11 added to the mass in proportion to provide Magnesium hydroxide is ordinarily prean amount equivalent to the amount of 30 pared in the presence of water by mixing water-therein, and the mass is subjected to .magnesium oxide with water or otherwise. evaporation until the water; has been re- It is an extremely light material, and in the moved substantially. It is not .necessary presence of water is somewhat elatinous. that all of the water be separated since it is When the water 1s separated by raining a the function of the glycerine to retard the 35 mass is obtained which is reasonably solid chemical activity of the magnesium hydro but which, nevertheless, contains ordinarily ide and this will be accomplished with a not more than 14% of magnesium hydroxpredominating proportion of glycerine in ide with 86% of water. This material may the mass. At the conclusion of the evaporabe mixed Wi h o her ingredients to.form a tion the mass will consist of a thick paste of 40 tooth paste, but it has been foundto be unapproximately the consistency of lard consatisfactory for the reasons above indicated. taining about fourteen per cent of magne- It is the object of the present invention to siu'm hydroxide suspended in glycerine. provide magnesium hydroxide in a form in The proportions will vary depending upon which it is free from the tendency to harden the amount of glycerine which is added 45 when combined with other ingredients of and are of relatively slight importance.

tooth pastes. .This paste, consisting of magnesium hy- I have discovered that the chemical activdroxide and glycerine substantially free ityof-magnesium hydroxide is retarded in from water, is adapted to be combined with.

the presence of glycerine to the extent that a various other ingredients in proper propor- 5 'erine which is substantially free from siredconsistency. For example, thirty-five water may be used as the basis of tooth parts of the magnesium hydroxide-glye pastes and that when so used it imparts to erine paste may be combined with thirtythe paste desirable properties, for example, five parts of precipitatechchalk. An ad.

' its tendency to neutralize acids. As a rare ditional amount of glycerine to give the 110 mixture of magnesium hydroxide and glyctions to produce a dentifrice of the de- 'ents of the mixture.

mixture the desired consistency is then added together with suitable flavors and, if desired, Y

antiseptic materials. Preferably the glycerine 1s thickened with a proportion of gelatine, gum tragacanth, or other suitable inocuous material which is adapted to increase the body of the mixture. The paste thus prepared ma be packed in suitable containers and distributed to the trade.

While I do not desire to be limited to any particular explanation of the effect of glycerine it may be assumed properly that glycerine prevents ionization of the magnesium hydroxide and that consequently 1t is incapable of reacting with other ingredi- In any event I have found that dentifrices prepared with the magnesium hydroxide and glycerine paste as a base may be stored under the usual conditions for practically indefinite periods without deterior. tion, whereas pastes in which water suspensions of magnesium hydroxide are used harden rapidly and become worthless in a comparatively short time.

Inasmuch as the magnesium hydroxideglycerine mixture may be made the basis of numerous compositions which are suitable for use as dentifrices, I desire to claim as my invention particularly the suspension of magnesium hydroxide in gl cerine for use in dentifrices and pastes inc uding this suspension as an element of their composition.

As herein indicated various changes may be made in the proportions of the parts and in the methods employed in preparing the product without departing from the invention or sacrificing any of the advantages thereof.

I claim 1. A dentifrice material consisting of magnesium hydroxide from which substantially all water has been removed by displacement with glycerin and evaporation.

2. A dentifrice material comprising magnesium hydroxide substantially free from water and suspended in glycerine.

3. A dentifrice material consisting of mag-- nesium hydroxide suspended in a proportion of glycerine equivalent to the water present in a water-suspension obtained by draining milk of magnesia.

4. A tooth paste including in its composition magnesium hydroxide substantially free from water and suspended in glycerine.

5. A tooth paste comprising magnesium hydroxide suspended in glycerine and sub stantially free from water, together with abrasive and flla-voring materials.

In testimony whereof I afiix my signature.

FERDINAND W. NITARDY. 

